Preparation method of intelligent composite material containing delamination damage

Abstract

The invention discloses a preparation method of an intelligent composite material structure containing delamination damage and mainly solves the problems that influence on the material self is great when the intelligent composite material is prepared in the prior art and preparation cost is high. According to the scheme, the preparation method comprises the following steps: cutting fiber cloth byadopting a cutting machine, thus obtaining fiber cloth strips with different fiber ply angles; paving a fiber Bragg grating sensor on every two fiber cloth strips by adopting a trapezoid slide routingstructure, thus forming an optical fiber layer, placing two optical fiber layers back to back, and placing a polytetrafluoroethylene film in the middle as a prefabricated damaged layer; then taking the damaged layer as a starting point, respectively paving the same number of layers of the fiber cloth strips above and below the two optical fiber layers, thus forming a well-overlaid fiber cloth strip whole, then sequentially covering with an isolating membrane, a ventilated felt and a vacuum bag, and sealing with high temperature sealant; and finally transferring the well-sealed whole into a hot pressing tank, and curing at set technological conditions, thus obtaining the intelligent composite material containing the prefabricated damaged layer. The preparation method disclosed by the invention has small influence on the material self, is low in preparation cost and can be used for health detection on the composite material.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of an intelligent composite material, which can be used to analyze the damage evolution process of a certain composite material in experiments. Background technique [0002] The delamination damage of composite laminates is the main damage mode that affects the structural bearing capacity. Composite laminate structures are easily subjected to low-energy impacts during processing, assembly and service, and delamination damage occurs between layers. Since delamination damage often occurs inside the laminate, it is difficult to observe visually on its surface, so delamination damage is a hidden safety hazard that cannot be ignored for composite laminate structures. To sum up, systematic research on the delamination damage of composite structures is of great significance to the actual engineering structure design, manufacture and maintenance of comp...

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Problems solved by technology

The X-ray detection method has high sensitivity and intuitive detection results, but the rays are attenuated due to absorption and scattering during the process of penetrating the material, so there is a certain limit to the thickness of the detection workpiece, and X-rays are harmful to the human body, and the detection personnel need to do special work. protection, the cost of experiment is high; the ultrasonic testing method uses the characteristics of strong penetrating power and good directivity of ultrasonic waves to various materials to detect surface and internal defects of components. It is simple to operate, high in detection sensitivity, and can accurately determine the position and distribution, but using this method usually requires couplant, and different probes are used for different types of defects, and the experimental procedures are complicated; Detection methods are difficult or inaccessible, such as detection in high and low temperature, nuclear radiation, flammable and explosive environments. The acoustic emission detection method is sensitive to dynamic defects and only needs to receive sensors, but this method is not sensitive to static defects and damages the signal. Indistinguishable from noise signal

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